Scott: A healthy person can read a medical dictionary about all the things that can go wrong and eventually start to feel a little sick. It's kind of like that. Your Copal shutters are probably all working just fine and will continue to do so for decades. They are EXTREMELY reliable. You can buy inexpensive digital timers for shutters, and they work pretty well on the slow speeds. Once you get above about 1/60th or 1/125th (speeds you're probably never going to use anyway) they always say your shutter is running slow. (Either because it is or because you need a much more expensive and sophisticated meter to take into account the effective time the shutter is fully open after you discount for time spent opening and closing.) If you like buying older shutters in various stages of neglect or disrepair, one of those gadgets is kind of handy, within its limitations. For what you have, I'd say you don't need it and you probably never will. When you are out there using those fine lenses, listen to the sound of the shutter at the speeds you use the most. If you pay attention, a significant error in the slower speeds will become very obvious to you by the time it finally happens, if ever. You'll know something is wrong.